• Topic ID: task_s1t_p2w_1jb
  • Version: 2.0
  • Date: Oct 28, 2019 4:25:12 AM

No Load kV Test

Prerequisites

Overview

Objective

  • The purpose of this test is to verify that the HV power inverter and HV tank are working properly. The exposure is taken as in application mode except that no filament drive nor anode rotation is running. Verification is made that the inverter currents are correctly set and that kV regulation is operating properly. As no filament drive is applied, no x-rays are generated.

    This test also allows to separate generator from HV cable or x-ray tube problem by running it with or without HV cables plugged on the HV tank ( see Notice) This test requires manual operation.

    Summary

  • Remove HV Candlesticks from tank receptacles

  • Fill tank receptacles with oil

  • Run diagnostic

  • Clean up

note: First execute the test with the HV cables connected.

Procedure

  1. Launch the GENERATOR TOOL.
  2. Launch the NO LOAD KV DIAGNOSTIC tool.
  3. Run the diagnostic. Verify:

    • No error is reported on the console

    • inverter gate_cmd board Leds DS101, DS 102, DS201, DS202 are lit: IGBTs gate drive supply is working properly.

      If this test does not pass, then execute the test with the HV cables disconnected.

    • warning
    • Potential for Shock.
    • Voltage may be present.
    • Use proper lockout/tagout procedures before replacing components.
  4. If needed, remove gantry side and front covers.
  5. Remove the JEDI FAN Assy.
  6. Remove HV cable candlesticks from tank receptacles.
    7. Notice Image
    • notice
    • Equipment damage possible. You must fill the receptacles with oil to avoid arcing.
  7. Fill tank receptacles with oil.
  8. Power on the generator using 120VAC Enable and HVDC Enable switches on the service switch panel. Also press ESTOP DRIVES RESET.
  9. Launch the GENERATOR TOOL.
  10. Launch the NO LOAD KV DIAGNOSTIC tool.
  11. Run the diagnostic. Verify:

    • No error is reported on the console

    • inverter gate_cmd board Leds DS101, DS 102, DS201, DS202 are lit : IGBTs gate drive supply is working properly

Finalization

  1. If the latter part of the test passes, along with the “Shorted Inverter Test ”, the system more than likely has a tube or HV cable problem.